I remember reading this short story in middle school (2009-2011). I think it was set in an abandoned underground subway in NYC, but we don't find that out at all. The way everything is described makes the place sound like a really creepy undiscovered new world, almost futuristic. You have to use your own reason and logic to piece together that the descriptions are of escalators and other machines no longer in service.
It was also a very vague story. They didn't delve much into the characters if I remember right. It was focused more on the details of the scenery and what or "who" could have possibly created it and what it was used for.